*{
    margin: 0;
    padding: 0;
}
ul li{
    list-style: none;
}
.box{
    width: 700px;
    margin: 0 auto;
    text-align: center;
}
h1{
    margin-bottom:10px;
}
.move{
    color: red;
    font-size: 18px;
    font-weight: 700;
    width: 30px;
    text-align: center;
    display: inline-block;
}
.reLoad{
    outline: none;
    cursor: pointer;
    background-color: skyblue;
    padding: 5px;
    font-size: 18px;
    color: white;
    margin-left: 50px;
    border: 0 ;
}
.run{
    margin-top: 20px;
    width:650px;
    height: 610px;
    border-radius: 10px;
    box-sizing: border-box;
    padding: 10px 30px;
    box-shadow: 5px 5px 5px 5px rgb(107, 103, 103);
    /* 渐变色 linear-gradient（color1，color2） */
    background: linear-gradient(rgb(64, 214, 214), rgb(185, 76, 185));;
    /* flex 布局 */
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
}
.run li{
    box-sizing: border-box;
    background-color: #2e3d49;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0;
    color: #ffffff;
    text-align: center;
    /* 水平翻转180度  c3动画*/
    transform: rotateY(180deg);
    transition: transform 0.3s;
}
.run li.open{
    background-color: #02b3e4;
    cursor: default;
    /* 水平翻转360度  c3动画*/
    transform:rotateY(360deg);
    transition:transform 0.3s;
}
.run li.show{
    font-size: 34px;
}
.run li.couple{
    cursor: default;
    font-size: 34px;
    background: #02ccba;
    animation: bigger 0.3s alternate;
}
/* 自定义动画 放大比例  */
@keyframes bigger{
    from{transform:scale(1)}
    to{transform:scale(1.1)}
}